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Responses ofQuercus sapwood to infection with the pathogenic fungus of a new wilt disease vectored by the ambrosia beetlePlatypus quercivorus
Journal of Wood Science volume 47, pages 425–429 (2001)
Abstract
Quercus serrata andQ. crispula wilt during the summer in wide areas along the Sea of Japan. Mass attacks of trees by an ambrosia beetle (Platypus quercivorus) are characteristic before appearance of the wilting symptoms. This study investigated the pathogenic effects of a fungus detected specifically in the wilting trees. This hyphomycete fungus,Raffaelea sp., has a distribution that correlates with the discolored xylem area called wound heartwood in which vessels are dysfunctional. Tylosis formation around the hyphae indicates vessel dysfunction. In areas with discoloration, the fungal hyphae were invading living ray parenchyma cells from the vessel lumen. As a protective reaction the ray cells exuded yellow substances into the vessels, but these substances seemed ineffective against the fungal activity, probably because the fungus disperses along the beetle's gallery before enough substance can accumulate. It should allow wide discoloration in sapwood. Cambium was not necrotic around the fungus. The cytological process in the host was as follows: (1) synthesis of secondary metabolites by the stimuli of oak fungus; (2) exudation of yellow substances into vessels; and (3) dysfunction of vessels and wound heartwood formation. In regard to wilting of trees, the pathogenicity of the fungus should be assessed by its ability to stop sap flow.
References
Nunokawa K (1993) Distribution of oak trees attacked byPlatypus quercivorus in Niigata Prefecture (in Japanese). For Pests 42:210–213
Ito S, Yamada T, Kuroda K (1992) Investigation of oak trees mortality in the Kansai district (in Japanese). Ann Phytopathol Soc Jpn 58:545
Wood SL, Bright Jr DE (1992) A catalog of Scolytidae and Platypodidae (Coleoptera), Part 2: Taxonomic Index. Great Basin Naturalist Memoirs 13:1–1553
Hijii N, Kajimura H, Urano T, Kinuura H, Itami H (1991) The mass mortality of oak trees induced byPlatypus quercivorus (Murayama) andPlatypus calamus Blandford (Coleoptera: Platypodidae): the density and spatial distribution of attack by the beetles. J Jpn For Soc 73:471–476
Kile GA, Eliott HJ, Candy SG, Hall MF (1992) Treatments influencing susceptibility ofNothofagus cunninghamii to the ambrosia beetlePlatypus subgranosus in Australia. Can J For Bot 22:769–775
Kile GA, Hall MF (1988) Assessment ofPlatypus subgranosus as a vector ofChalara australis causal agent of a vascular disease ofNothofagiis cunninghamii. NZ J For Sci 18:166–186
Ito S, Kuroda K, Yamada T, Miura Y, Inoue S (1993) Investigation of fungi associated with the mass mortality of oak trees (in Japanese). Ann Phytopathol Soc Jpn 59:290–291
Ito S, Kubono T, Sahashi N, Yamada T (1998) Associated fungi with the mass mortality of oak trees (in Japanese with English summary). J Jpn For Soc 80:170–175
Ito S, Kubono T, Yamada T (2000) Mass mortality of oak trees in Japan. Proceedings of the 3rd regional workshop of IUFRO 7.03.08, Forest protection in Northeast Asia, July 31–August 4, 2000, Chiayi, Taiwan, pp. 182–185
Kuroda K, Yamada T (1996) Discoloration of sapwood and blockage of xylem sap ascent in the trunks of wiltingQuercus spp. following attack byPlatypus quercivorus (in Japanese with English summary) J Jpn For Soc 78:84–88
Hillis WE (1987) Heartwood and tree exudates. Springer-Verlag, Berlin, p 268
Shigo AL, Hillis WE (1973) Heartwood, discolored wood, and microorganisms in living trees. Annu Rev Phytopathol 11:197–222
Kozlowski TT, Winget CH (1963) Patterns of water movement in forest trees. Bot Gasette 124:301–311
Zimmermann MH (1983) Xylem structure and the ascent of sap. Springer-Verlag, Berlin, p 143
Pearce RB (1996) Tansley review no. 87: antimicrobial defenses in the wood of living trees. New Phytol 132:202–233
Sone K, Mori T, Ide M (1998) Life history of the oak borer,Platypus quercivorus (Murayama) (Coleoptera: Platypodidae). Appl Entomol Zool 33:67–75
Shigo AL (1984) Compartmentalization: a conceptual framework for understanding how trees grow and defend themselves. Annu Rev Phytopathol 22:189–214
Shibata N, Harada H, Saiki H (1980) Formation and wall structure of tyloses inCastanea crenata. Bull Kyoto Univ For 52:206–215
Sinclair W, Lyon HH, Johnson WT (1987) Diseases of trees and shrubs. Cornell University Press, Ithaca. NY, pp 364–365
Sperry JS, Tyree MT (1988) Mechanism of water stress-induced xylem embolism. Plant Physiol 88:581–587
Kuroda K (1991) Mechanism of cavitation development in the pine wilt disease. Eur J For Pathol 21:82–89
Christiansen E, Solheim H (1990) The barkbeetle-associated bluestain fungusOphiostoma polonicum can kill various spruces and Douglas fir. Eur J For Pathol 20:436–446
Elliot HJ, Kile GA, Candy SG, Patkowsky KA (1987) The incidence and spatial pattern ofNothofagus cunninghamii (Hook) Oerst. attacked byPlatypus subgranosus Schedl in Tasmania's cool temperate rainforest. Aust J Ecol 12:125–138
Payton IJ (1989) Fungal (Sporothrix) induced mortality of kamahi (Weinmannia racemosa) after attack by pinhole borer (Platypus spp.) NZ J Bot 27:359–368
Solheim H (1992) The early stages of fungal invasion in Norway spruce infested by the bark beetleIps typographus. Can J Bot 70:1–5
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Kuroda, K. Responses ofQuercus sapwood to infection with the pathogenic fungus of a new wilt disease vectored by the ambrosia beetlePlatypus quercivorus . J Wood Sci 47, 425–429 (2001). https://doi.org/10.1007/BF00767893
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DOI: https://doi.org/10.1007/BF00767893